A simple dispersive liquid-liquid microextraction method for determination of Ag(I) by flame atomic absorption spectrometry

A simple and efficient dispersive liquid-liquid microextraction (DLLME) procedure was optimized for the determination of Ag(I) by flame atomic absorption spectrometry (FAAS). In this method, 8-hydroxyquinoline was used as a chelating reagent for Ag(I) and resulted complex was extracted in chloroform, while ethanol is used as disperser solvent. The effective parameters on the recovery of Ag(I), such as the pH of sample, the type and volume of extraction and disperser solvents, the amount of 8-hydroxyquinoline reagent, extraction time, the effect of temperature and interfering ions of sample solution were investigated. The calibration graph of this procedure was linear in the range of 0.02-0.4 mg L−1 with detection limit of 2.0 μg L−1 (n = 21). The relative standard deviation (RSD) was 4% and the preconcentration factor was 65. Good recovery (%) values were obtained changing between 95 and 102%. The certified reference material (CWW-TM-D waste water) was used to verify the accuracy of the developed method (recovery, 96%). The proposed method was applied for determination of silver in different water samples, anode slime and cream samples.